Context Limit Viewer

[dbalders]

What Changed

Adds in a compact context limit view in the composer based on Codex last_token_usage.total_tokens.

• Displays a small ring showing how much thread context is being used
• On click, shows the actual context numbers in the same menu/popover style as the other composer controls
• Moves into the existing ... composer controls UI when the window gets smaller

Why

Fixes #974: Displays context in a minimal way within the existing layout. It gives users a quick read on thread context usage where they are already working, and lets them click for the exact numbers.

UI Changes

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes

Note

Add context limit viewer to the chat composer

• Adds a ComposerContextUsageIndicator component to the chat composer that displays a circular progress ring showing context window usage, severity (neutral/warning/danger), and an optional compaction dot with a details popup.
• Introduces deriveThreadContextUsageSnapshot in session-logic.ts to compute normalized usage (usedTokens, maxTokens, percentUsed) and compaction recency from thread activity streams, invalidating stale usage when compaction is newer.
• Extends the CodexAdapter to emit thread.token-usage.updated runtime events from codex/event/token_count payloads, replacing the previous thread/tokenUsage/updated handling.
• Extends ProviderRuntimeIngestion to map thread.token-usage.updated into thread.context.usage.updated activities and thread.state.changed (compacted) into thread.context.compacted activities.
• Behavioral Change: CodexAdapter no longer emits events for thread/tokenUsage/updated; only codex/event/token_count produces token usage events.

^{Macroscope summarized 479d66b.}

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